A formula to check on everyone's first day attendance

[hakim_tanzil]

Hi everyone,

date day name check
1/11/17 wed andy OK
1/11/17 wed carl OK
2/11/17 thu andy
2/11/17 thu brian OK
2/11/17 thu carl
3/11/17 fri brian
3/11/17 fri dan OK
4/12/17 mon andy OK
4/12/17 mon dan OK
5/12/17 tue andy
5/12/17 tue brian OK

I've been trying to populate a formula on column D to "OK" the first day of each attendance of every single months. Not an array formula nor any kind of VBA please, as me and all my colleagues are not familiar with any of those. Anyway, these are some of the formulas that I've tried and not working:
1. IF(A2=MIN(IF(C2=NAME;DATE));"OK";"")
2. IF(A2<=WORKDAY(EOMONTH(A2;-1)+1;1);"OK";"")
3. I tried to stick with a day, ex: Fri, but that didn't work out too
4. I've tried google and one page show CEILING formula but that didn't work out as well
5. My excel is still 2007, so no MINIFS feature like the one in 2016

So, truly if anyone could really help me on this, I'd greatly appreciated. Any thoughts or inputs are welcome

 

[Marcelo Branco]

Try

D2 copied down
=IF(SUMPRODUCT(--(MONTH(A$2:A2)=MONTH(A2)),--(C$2:C2=C2))=1,"OK","")

M.